Mine are mostly work related gripes -
People who don't wash the dirty soapy water off dishes after washing up - arghhhhhh - it means that I have rinse everything before I can use a mug or a teaspoon......
People who are too lazy to turn off the light switch in the kitchen, so the (exceedingly noisy) extractor fan continues to run and I have to get up from my desk and walk all the way over there to turn it off cos the noise drives me bonkers....... I am coming close to actually dismembering that extractor fan....
People who eat noisily at their desk - munch, munch, crunch, crunch, especially eating crisps, and it's even worse when they've *borrowed* my desk to do it at cos they leave crumbs all over my keyboard......
Finding food crumbs in the cutlery tray - now how gross is that ????